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Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Earnings Per Share [Line Items]
Stock options, outstanding	1,259,317	1,670,688	1,259,317	1,670,688	1,610,988
Stock options, weighted average exercise price	$ 7.61	$ 4.87	$ 7.61	$ 4.87	$ 5.07
Common stock excluded from calculation of diluted earnings per share	263,475	161,000	289,475	469,500

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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